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z~ disease, competition, predation, and hybridization. Gradually declining flows following peak spring runoff are desired. Year-round low flows aid growth of channel catfish, a potential competitor and predator of humpback chub. Bonvtail Chub r, Because so few bonytail chub were collected in the wild, their summer behavior and requirements are unknown. It is hypothesized that if the habitat and life history .requirements of squawfish and humpback chub are met, then the remaining bonytail chub will benefit. Razorback Sucker Recruitment failure of razorback suckers presumably occurs in late spring and early summer. This failure was linked elsewhere with predation by introduced fish (including common carp and channel catfish) and may be associated with loss of flooded bottomlands and lowered river temperatures. Lower flows may favor proliferation of potential predators. Autumn and- Winter rado Sauawfish Low flows in late summer and autumn are correlated with availability of nursery habitat, young fish abundance, and growth. Backwater habitat (quantity and quality) in the upper Green River should be maximized through regulating Flaming Gorge releases. Reregulation should, however, consider tributary inflows provided by the Yampa River. Unusually high flows in the late summer and autumn reduce availability of nursery habitat for young Colorado squawfish. Stable winter flows reduce ice scouring of shoreline habitats used by overwintering adults and young, and stable winter base flows ~y reduce stress to the fish. Humpback Chub Habitat use and flow needs of the humpback chub during autumn and winter are not well understood. Observations during low-flow periods noted that Gila species were constrained to pools in dewatered rapids and other impounded waters. Conditions favoring reproduction and growth of channel catfish should be identified and avoided because of possible negative interactions between these species. Bonvtail Chub because so few bonytail chub were collected in the wild, their autumn/winter behavior and requirements are unknown. It is hypothesized that if the habitat and life history requirements of squawfish and humpback chub are met, then the remaining bonytail chub will benefit.